It took me a whole hour to (solve) the problem.

题库:综合类 类型:最佳选择题 时间:2017-07-03 03:14:25 免费下载:《词汇语法》Word试卷

It took me a whole hour to (solve) the problem.
A.work at
B.work on
C.work out
D.work over

本题关键词:IT,僵a,ECF-A,EP21-A,EP6-A,EP18-A,EP7-A,Lp(a),Lp（a）,A-aDO2;